Station indicator for radioreceivers



May 2, 1933. M. ARQN ET AL STATION INDICATOR FOR RADIORECEIVERS FiledApril 2l. 1932 Patented May 2, 1933 UNITED STATES PATENT OFFICE MANFREDARON, OF BERLIN-WESTEND, AND HANS KANTE, OF BERLIN, GRMANY, AS-

SIGNORS T0 ARONWERKE ELEKTRIZITTS AKTIENGESELLSCHAFT, OF BERLIN-CHARLOTTENBURG, GERMANY, A CORPORATION OF GERMANY STATION INDICATOR FORRADIORECEIVERS Application led April 21, 1932,7Seria1 No. 606,646, andin Germany September 28, 1931.

This invention relates to station indicators used in conjunction withthe tuning means of radio receivers.

In such station indicators, the names of the stations are imprined on ascale which is connected with the tuning means, and the station namesare related or connected by iixed reference lines to the scalegraduations correspondingto the relevant wave lengths. The gauging ofthese scales, however, is a matter of much difficulty, because thetuning circuits of individual receivers, as a result of dierencesarising in course of manufacture, exhibit certain deviations which makeit necessary to gauge each scale individually.

In order to overcome this diiiiculty, adjustable riders have beenarranged on the station scale, which riders are imprinted with or carrythe different station names. The disadvantage of such station riders isthat they become easily lost, and, in consequence of the imprintingthereon, they occupy relativ ely much space, so that only a very limitednumber can be put on the scale at one time.

The object of the present invention is to provide station scales withmeans whereby the gauging of scales of individual receivers can becarried out more quickly and easily than hitherto, and in such a mannerthat the scale can be gauged or standardized in respect of any number orthe whole of the stations of which the names are imprinted or carriedthereon.

According to the invention, a station indicator for a radio receiver isprovided with gauge pointer means so adjustable in relation tograduations marked or Xed along with station names on a station scale,that the correct relation between any or all of the station names andthe graduations can be standardiyled or gauged for the receiver by thesaid pointer means. 0

More specifically, a station indicator is provided with a scale havingsmall gauge pointers o adjustably secured or riveted thereon inadjacency to one or more of a number of station names, the pointer ofeach station being so made that it can be turned or directed as desiredon to the graduated part of the scale which is found in practice tocorrespond with proper tuning of the receiver to the said station. f

If desired, pointers correspondingto dierent stations or wave lengthsmay be made in different colours or otherwise distinguished from eachother. The pointer or pointers may also be madev of transparent materialsuch as Celluloid, and this material may be slightly coloured.

D In accordance with a further feature of the invention, the pointersmay be constituted by vflexible elements, the bending of which'serves toindicate the standardized connection or relationship between the stationnames and graduations for tuning purposes'. Thus, the station scale maybe provided with holes through which thin flexible wire or wires is orare inserte-d. One end of these wires may be disposed on the front ofthe scale to con stitute a pointer, whilst the other end is ixed to therear of the scale. Alternatively, each piece of wire may be drawnthrough tWo holes of the scale, in such a manner that the wire runs overthe back of the scale and itstwo ends each form a iiexible gauge pointerat the front. If desired, the holes for the gauge pointers of successivestation names may be arranged alternately right and left.

Embodiments of the invention-will now be described, by Way of example,with reference to the annexed drawing, in Which:-

Fig. 1 is a view of a station scale adapted to b e wrapped on a drumconnected with the tuning means;

Fig. 2 is a perspective view of the scale (F 1g. l) in position on thedrum;

Fig. 3 is a diagrammatic view of the scale anddrum in the radioreceiver;

Figs. 4 and 5 are respectively rear and front views of another form ofstation scale according to the invention.

Referring to Figs. l and '2 jThe scale a has the usual graduations atits edges. and the different station names are arranged up the middle.Each station name is imprinted at the position of the graduation whichcorresponds to the wave length of the relative station. In order totakeinto account unavoidable inaccuracies of the i1n, prints, a smallpointer b is turnably fixed (e. g. riveted) beside the station names orbeside certain of these names on the scale. The said pointer is directedtowards the graduations of the scale and can be easily adjusted by theuserV of the apparatus to obtain correct tuning-in or reception withrespect to the relative station. Thereupon it forms a permanent recordof the standard graduation for the relative station. It the pointer ismade of such a length-as to extend over the width of the scale, as, forexample, the pointer 0, it can suitably be made of transparent materialwhich, for the purpose of easy and clear distinction, can be coloured.The pointers corresponding to different wave lengths may be made indiilerent colours in order that they may be readily distinguishable fromone anot-her. If the scale is connected with the movable tuningmeansjthe reading of the scale is taken at a iixed index mark, which inFig. 1, is indicated by a transverse line extending across the breadthof the scale. Instead of this, a reverse arrangement is possible, inwhich the scale printed with the station names is fixed, and the indexmark is connected with the tuning means and is movable before thescale.y y

The former arrangement is shown diagrammatically in Fig. 3, in which thestation scale is connected with a rotatable timing means, and is movableover a window provided in the casing of the radio receiver, this windowhaving xed to it a stationary index member.

Referring to Figs. 4 and 5:- As is set forth in these igures, the scalea is provided alongside the station names with small holes b1, b2.Through these holes are inserted pieces of very thin and iiexible wire c(e. g. copper wire of 0.4 mm. diameter), 1n such a manner that the endsc1 of the wire project outwards at the front of the scale and serve asgauge pointers, which Ican easily be bent into the desired position. Theprojecting ends 01 of the wire lie close to the upper surface of thescale, and, as is clear from Fig. 4, the wire is of such a length thatit sticks through bot-h holes b1, b2 and runs across thek rear side ofthe scale. In this case, it is suiiicient to arrange the holes besidethe station name's alternately right and left, so that the piece of wirewith successive stations is drawn through the right hole of the onestation and the left hole of the other station. The holes Z) as well asthe thickness of the scale a are greatly mag nitied in the figures. Inpractice, the scale consists of thin celluloid or pasteboard, whilst theholes are only so big as to enable the wire to be drawn through. *Y

Obviously, also, other arrangements of the pieces of wire on the scaleare possible. For example, one end of the wire can be pasted orotherwise fastened on the rear side of the scale. Moreover, it ispossible to select wires with different colours corresponding to thedifferent wave lengths.

Ve claim l. A. station indicator for a radio receiver having, incombination, station scale means provided with station names andgraduations arranged in accordance with wave lengths, pointer means forsaid scale means, index means adapted to co-operate with saidgraduations, and means for adjustably securing said` pointers on saidscale means so that for any station said pointer means can be directedon to the part of said graduations which in register with said indexmeans gives correcttuning-in to said station by said receiver.

2. In or for a radio receiver, the combination of a station scale havingthereon station names and graduations arranged according to wavelengths,gauge pointers for said scale, and means whereby each said pointer is`turnably iixed on said scale beside a station name thereon to enable arecord to be obtained of the part of said graduations corresponding inrespect of said station name with correct tuning-in of said receiver.

3. ,A stationscale Vfor radio receivers, having station names andgraduations provided thereon in comb-ination with gauge pointers,

and means whereby said pointers are riveted to said scale so as to beturnable to indicate correspondence between any station name andgraduation of said scale for tuning purposes.

4:. In or for a radio receiver, the combination of a station scalehaving thereon station names and graduations arranged according towave-lengths, a plurality of gauge pointers provided on said scale forsaid different station names and made diiierent from each other so as tobe readily distinguishable, and means whereby each said pointer isturnably fixed on said scale beside a station name thereon to enable arecord to be obtained of the part of said'graduations corresponding inrespect of said station name with correct tuning of said receiver.

5. A stationscale for radio receivers, havingstation names andgraduations provided thereon in combination with gauge pointersdistinctively coloured from one another, and means whereby each saidpointer is secured to said scale so as to be turnable to indicatecorrespondence between a station name and part of said graduations fortuning purposes.

6. A station indicator for a. radio receiver having, in combination,station scale means provided with station names and graduations arrangedin accordance with wave lengths, gauge pointer means made of transparentmaterial, index means adapted to co-operate with said graduations, andmeans for adjustably securing said pointers on said scalel means so thatfor any station said pointer means can be directed to the part of saidgraduations which in register With said index means gives correcttuning-in to said station by said receiver.

7 A station indicator according to claim 6 comprising gauge pointermeans made of transparent material slightly coloured.

S. A station indicator' according to claim 6 comprising gauge pointermeans made of celluloid.

9. A station indicator for a radio receiver comprising a station scalehavin g thereon station names and graduations arranged according to Wavelengths, leXible pointer elements for said scale, and means whereby saidpointer elements are secured to said scale so thatpart thereof can bebent to indicate correspondence between any station name and graduatedpart of said scale for tuning purposes.

10. A station indicator for a radio receiver comprising a station scalehaving thereon station names and graduations arranged according to Wavelengths, pointer elements made from thin flexible Wire inserted throughholes in said scale, and means whereby said pointer elements are securedto said scale so that they can be bent to indicate correspondencebetween any station name and graduated part of said scale for tuningpurposes.

11. In or for radio receivers, a` station scale having thereon stationnames and graduations arranged according to wave lengths, ivire pointersdrawn through holes in said scale adjacent station names andgraduations, and means for securing said Wire pointers on said scale soas to be adjustable to compensate for deviations between said stationnames and graduations indicated as of corresponding Wave length to saidnames.

12. A station scale for radio receivers having station names andgraduations provided thereon in combination with gauge pointers, andmeans whereby said pointers are secured on said scale alternately rightand left of successive station names thereon, so as to be turnable toindicate correspondence between any station name and adjoininggraduations for tuning purposes.

13. A station indicator for a radio receiver comprising a station scalehaving thereon station names and graduations arranged according to Wavelengths, pointer elements made from thin flexible Wire inserted throughholes in said scale provided alternately right and left of successivestation names thereof, so that ends of said Wire can be bent to indicatecorrespondence between any station name and graduated part of said scalefor tuning purposes.

14. In or for radio receivers, a station scale having thereon stationnames and graduations arranged according to Wave length, Wire pointersdrawn through holes in said

